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Fig. 2. Frequency distribution (%) of all the food-unloading events of different
durations recorded in the constant series (each trophallaxis lasting more than
4 s was considered as an experimental unit). Data from 32 bees. Results are
shown for each of the two different flow rates of sugar solution offered at
the GF (grey bars, 3 µl min-1; open bars, 90 µl
min-1).